Rotary jar



Patented 1...; 24, mo"

PATENT. oerce 1 ao'rsnr JAR George as. Boulter, Bakersfield. Cain -assignmto Jansen. Kalmnerdiner, Los Angeles, Calif.

. 7 Application March so, me, Serlal No. cam

s cums. (01. 255-27) The present invention relates'to rotary jars and pertains particularly to the rotary system of drilling oil or other deep wells.

In the drilling or reconditioning or oil and gas 5 wells it often happens that tools or pipe become stuck within the well bore. In the event that the driller cannot pull loose such tools or pipe,- which are called it then becomes necessary to employ a rotary jar. By the use oi o rotary Jar a series or severe blows are delivered .ggim the "fish" until it is cleared from the well In the'reconditioning of oil or gas wells it may also be an advantage to remove a certain amount 1 of pipe or casing that may have been cemented into the well at a previous time. .To do this it is necessary that the casing be cut at the desired depth and then a set of rotary Jars are employed to iar the severed piece from the well bore. go The general object o! the invention is to pro vide a rotary jar that is less expensive, hits a harder jarring blow and is generally more eflective and more eiiicient than Jars now in use. Another object is to provide an adjustable ro- 5 tary Jar that is capable oi delivering a jarring blow in an upward direction while the strain necessary to develop such blow is maintained on the f'fish" throughout the jarring action.

Other objects and advantages oi the invention 30 will be apparent from the following description and the accompanying drawing forming a part thereof, in which.

Fig. 1 is a longitudinal section of my Jar shown in its retracted position. 35 Fig.2 is a longitudinal section of my Jar shown in its expanded position.

Fig. 3 is a horizontal cross section or my jar taken on line 3-4 of Fig. 1.

Fig; 4 is a plan view of one oi-the conical spring 40 members for actuating thepiunger hammer to strike the anvil to deliver a jarring blow.

7 Fig. 5 is a diametrical section oi the ring mem- 1 her shown in Fig. 4.

Fig. '8 is a horizontal cross section my Jar is taken online H otl'lg. 1.

Fig. 'l is a horizontal section or my jar taken on line 'l oirig. 1.

Reterring more particularly to the drawing in which corresponding parts are designated by the 50 same reference characters in all the figures, l designates the lower member and I the upper member of my Jar. The lower member I comprisesashanklandaheadlonthelowerend of said shank, which head is formed with a deupendingthreededpinliorensagingatbneded.

box in the fish (not shown) tor connecting said lower member I to said fish for jarring the same, in the manner hereinafter more fully described. The shank I is formed with'a plurality oi undercut splines 6. The upper member 2 of the'jar comprises a tubular casing l, a lower bushing 8 screw seated at 9 in the lower end of said casing and an upper bushing it screw seated at l I in the upper end of said casing. The lower bushing 4 is provided with a central axial open- 10 ing l2 and a plurality oi undercut axial grooves ll extending from said opening 12, through which opening and grooves slidably extend the shank l and splines 6 respectively or the lower member lot the Jar, the engagement of said splines with said grooves preventing relative ru- 1 tary movement or the lower member I and the upper member 2 o! the jar. The upper bushing III is formed in its upper end with a threaded box It for engagement with a threaded pin (not :0 shown) on the lower end of a fishing string. The lower member I is provided with a central axial bore I! extending therethrough and in the upper end of the shank 8 is screw seated at It the lower end or a tube ii in communication with the up- 45 'to .a point-near the lower end of said bushing, there being a nut screw seated in saidbore at 2| between the lower and upper ends oi said bore, torming a paclnng box 22 around the tube 11 which slidably extends through said nut 22. The lower inner end of the upperbushing ll of the upper Jar member 2 iormsananvil 23 to'be struck by the upper end or a plunger hammer 24 which is slidably 'fitted on the pipe ll 40 and is constructed with a: sleeve shank 25 also slidabiy fitted on said pipe, said shank being screw seated at its upper end at It in the lower end or said hammer 24 and extending downwardly from said hammer. The casing fl is formed with aninternal annular fiange 21 upon which rests the lowermost oi'a plurality of superimposed conical fiat springrings II. which conical rings are alternately inverted and rest, one upon the other, alternately, at their inner and so outer. edges in bellows formation. the lower end or the hammer 24 resting upon the uppermost or said rings. Said rings being resilient form a spring 2| between the supporting flange 21 and the hammer 24, which spring may be expanded as which spring engages at its lower end the upper necting the lower end of the hammer shank 25 and the upper end of. the shank 3 of the lower member I of the jar, for contracting the spring 29 when the upper member 2 of the jar is pulled upwardly by the fishing string, while the lower member I of the-jar is connected to a fish in an oil well hole. Said clutch 32 comprises a p1u-.

rality of clutch dogs 33, agrip ring 34 and a cam 35. The lower end of the clutch dogs 33 are formed with inturned lugs 36 which are turnably fitted in an annular groove 31 in the upper end portion of the shank 3 of the lower jar member I, whereby said clutch dogs are pivotally connected at their lowerends to the upper end of said shank, so that the upper ends of said dogs may swing inwardly and outwardly for the purpose to be described. The upper ends of the clutch dogs 33 are formed with engaging heads 38 which are formed with lower cam faces 39 and 40, and an upper cam face 4|. The cam 35 is formed-on the inside of the casing I extending around the same, and said cam is formed with a cam-face43 at its upper end. The grip ring 34 isv slidably fitted on the hammer shank 25 and is formed at its lower end with an external annular shoulder 44. The lower end of the ham-,

mer shank 25 is formed with an annular external shoulder 45 against which the lower end of the grip ring 34 abuts under the influence of a coil spring 46 surrounding the hammer shank 25,

end of the grip ring 34 at its upper end the lower side of the stop ring 30.

A stop ring 41 is secured'in a peripheral groove 48 in the upper portion of the shank 3 of the lower jar member I immediately below the lower ends of the clutch dogs 33 for .engaging the upper end of the lower bushing 8 and limiting the extension of the jar members I and 2 with relation to eachother.

The operation, uses and advantages of my invention are as follows:

The lower jar member I being connected by its threaded pin to a fish in an oil well, and the upper jar member 2 being connected by its threaded box I4 to the lower end of a fishing string, the parts of the jar, under the influence of the spring 29, first assume their initial position, v

as shown in Fig. 1 of the drawing, 'in which position the upper jar member 2 is lowered on the lower jar member I and the dogs 33 of the clutch 32 are swung outwardly so that their cam faces 39 are out of engagement with the grip ring shoulder 44, while their cam faces 40 engage the upper cam face 43 of the cam 33.

To jar the "fish" loose in the well, the upper jar member 2 is pulled upwardly with relation to the lower jar member I by the fishing string, which moves the cam 35 upwardly with relation to the clutch dogs 33, while the upper ends and heads 33 of said dogs are swung inwardly by the engagement of the cam faces 43 and 40 of said cam and dogs respectively, until the dog cam faces 39 engage the grip ring shoulder 44, in which position the dogs are held by the engagement of the inner surface ,of the cam 35 with the outer surfaces of the dog-engaging heads 33,

whereby the hammer 24 is held against upward movement and the spring 29 is compressed between the lower end of said hammer and the upwardly-moving seat flange 21 of the upper jar member 2, as shown in Fig. 2 of the drawing, until the lower end of the cam 35 moves upwardly past the dog heads 38 and the upper ends and heads 38 of the dogs 33 swing outwardly under the lower end of the cam 35, so that the upper cam faces H of said dog heads engage the lower cam face 42 of the cam 35 and the cam faces 39 of said dog heads escape the grip ring shoulder 44, whereupon the hammer 24 is projeoted upwardly with great force under the infiuence of the expansion of the spring 'rings 28 of spring 29, until the upper end of said hammer strikes the anvil 23 with a powerful upward jarring blow, the impact of which is transmitted through the upper jarring member 2 and the lower jarring member I to the fish, and the fish is thereby jarred upwardly, and if not jarred loose with the first jar applied thereto, as above described, the upper jar-member 2 is againlowered until the parts of the jar are again brought to their initial position, as shown in Fig. 1 of the drawing, and the above-described operations of the jar are repeated until the "fish is jarred loose in the well hole, so that it may then be lifted out of the well hole by the fish ngstring and jar.

By turning the grip ring sleeve 25, the engagement of the upper threaded end 26 of said sleeve with the hammer 24 moves said sleeve downwardly or upwardly with relation to said hammer, which determines the length of upward movement of the upper jar member 2 before the dog shoulders 39 engage the grip ringshoulder 44 and cause the spring 29 to be compressed between the hammer 24 and the flange 21, thus determining the degree of compression of said spring before the dogs 33 escape the grip ring 34 to allow said spring to act to cause the hammer to strike the anvil an upward jarring blow, and thus providing a means for adjusting the'force of the upward jarring blow of the jar. I

My jar, is applicable to rotary drilling apparatusfor drilling oil wells or other wells.

My jar delivers its jarring blow while the pulling strain on the jar members necessary to develop the force of the blow is maintained on the fish" throughout the jarring action, thus adding said jarring strain to the jarring blow and increasing the effectiveness of the jarring action and blow.

I do not limit my invention to the exact construction herein disclosed, since various changes may be made therein without departing from the spirit of the invention.

I claim as my invention:

1. In a jar, a pair of jar members, means for connecting one of said Jar members to a i "in a well, means for connecting said other jar member to a fishing string, an anvil mounted in one of said jfar members, a plunger hammer slidably mounted in said jar member in which said anvil jar member and holding said members against relative longitudinal movement, when sufllcient upward force is applied, through the fishing string, to the jar member connected to said string, to cause said dogs to'escape said shank shoulder and said cam and allow said compressed spring means to force said plunger hammer upwardly to strike said anvil with an upward blow.

2. In a jar, a lower jar member and an upper jar member mounted to telescope one within the other, means for connecting said lower jar member to a fish in a well, means for connecting said upper jar member to a fishing string, an anvil mounted in the upper end of said upper jar member, a plunger hammer mounted in said upper jar member, a shank depending from said plunger hammer, a dog shoulder onthe lower end of said hammer shank, a cam on said upper jar member, a ring-supporting shoulder in said upper jarfmember, a plurality of conical spring rings interposed between said ring-supporting shoulder and the lower end of said plunger hammer, said conical spring rings'being alternately inverted, a plurality of dogs connected to said lower jar member, for normally extending upwardly betweensaid dog shoulder and said cam and engaging the'upper end of said cam for holda to said upper'jarring member, to cause said dogs,

acted upon by said cam, to engage said dog shoulder and draw said plunger downwardly to compress said conical spring rings, and to escape said cam to release said dog shoulder to'enable said spring rings to expand and cause said plunger hammer to strike said anvil an upward jarring blow.

3. In a jar, a lower jar member, an upper jar member, said upper jar member comprising a tubular body and bushings respectively secured in the lower end and the upper end of said tubular body, means for connecting said lower jar member to a fish in a well, said lower jar member being formed with a splined mandrel extending upwardly through and slidably fitted in said bushing in the lower end of the tubular body of said upper jar member, to permit relative longitudinal movement of said jar members but to prevent relative turning movement of said jar members, means, for connecting the bushing, in the upper end of the tubular body of said upper jar member, to a fishing string, the lower end of said bushing forming an anvil, a plunger hammer slidably mounted in said tubular body of said upper jar member, spring means for urging said plunger hammer upwardly toward said anvil, said plunger hammer including a depending shank, a dog shoulder on said shank, a cam on the inside of the body of said upper jarmember, a plurality of dogs, connected to said' mandrel of said lower jar member, for engaging said cam and said dog shoulder on said hammer shank and drawing said plunger hammer downwardly against said spring 'means,.

when said upper jar member is pulled upwardly by said fishing string, and a stop ring fitted incamand said dog shoulder, under the influence of the upward pulling movement of said upper jar member by said fishing string, to release said plunger hammer, so that said spring means will cause said plunger hammer to strike said anvil an upward blow.

4. In a jar, a lower jar member and an upper jar member mounted to telescope one within the other, means for connecting said lower Jar member to a fish in a well, means for connecting said upper jar member to a fishing string, an anvil mounted in the upper end of saidupper jar member, a plunger hammer mounted in said upper jar member; a shank depending from said plunger hammer, a dog shoulder on the lower end of said hammer shank, a cam on said upper jar member, a ring-supporting shoulder in said upper jar member, spring ring means for urging said plunger hammer upwardly toward said anvil, a plurality of dogs connected to said lower jar member, for normally extending upwardly between said dog shoulder and said cam and engaging the upper end of said cam for holding said jar members in their retracted position,

and a 'stop on said lower jar member for engaging the lower end of said upper Jar member to limit the expanding relative movement of said jar members, under the influence of suflicient' upward force, applied, through said fishing string, to said upper jarring member, to cause said dogs, acted upon by said cam, to engage said dog shoulder and draw said plunger downwardly to compress said conical spring rings, and to escape said cam to release said dog shoulder to enable said spring rings to expand and cause said plunger hammer 'to strike said anvil an upward jarring blow, said lower jar member being formed with a longitudinal circulation duct extending therethrough, a circulation tube connected at its lower end to the upper end of said lower jar. member and communicating with said circulation duct, and said circulation tube extending upwardly through and slidably fitted in said plunger hammer'and its shank and the upper end of said upper jar member.

5. In a rotary jar, a pair of jar members slackly linked together with limited relative movement longitudinally and maintained against relative rotation, a hammer and an anvil mounted in one of said jar'members, compressible and expansible means mounted in said latter jar member and engaged bysaid hammer, means for causing said hammer to compress said expansible and compressible means when said jar members are" extended longitudinally with relation to each other, means for adjusting the compression of said compressible and expansible means, and

' means for releasing said hammer, when the jar members. are extended relatively longitudinally a predetermined distance, to enable saidconipressible and expansible means to cause said hammer to strike said anvil a jarring blow.

'6. In a jar, an anvil, a hammer, a spring, means actuated by upward strain exerted thereon for deforming the spring so that upon release of the deforming stress the spring operates the hammer to strike the anvil a jarring blow, means for holding against release of said deforming stress, and means engaging the holding means for preventing release thereof, the engaging means being movable'relative to the holding means by upward strain exerted on the engaging means, said relative movement of the engaging means disengaging it from the holding means to permit release of the holding means for operation of the hammer.

7. In a =jar, an anvil, a hammer, a spring, means actuated by upward strain exerted thereon for deforming the spring so that upon release of the deforming stress the spring operates the hammer to strike the anvil a jarring blow, means for holding against release of said deforming stress, and means engaging the holding means for preventing release thereof, the engaging means being movable relative to the holding means by upward strain exerted on the engaging means, said relative movement of the engaging means disengaging it from the holding means to permit release of the holding means for operation of the hammer.

8. In a jar, an anvil, a hammer, a spring, means actuated by upward strain exerted thereon for deforming the spring so that upon release of the deforming stress the spring operates the hammer to strike the anvil a jarring blow, means for holding against release of said deforming stress, said means being releasable by radial displacement thereof, and means for positively confining the holding means against radial displacement, the confining means being movable relative to the holding means by upward strain exerted on the confining means, said relative movement of the confining means disengaging it from the holding means to permit radial displacement and release of the holding means for operation of the hammer.

9. In a jar adapted for incorporation in a well string, an anvil, a hammer, a spring, means actuated by upward strain exerted thereon for. deforming the spring so that upon release of the deforming stress the spring operates the hammer to strike theanvil a jarring blow, means for holding against release of said deforming stress,

and means engaging the holding means for preventing release thereof, the engaging means being movable relative to the holding means by longi- GEORGE M. BOUL'I'ER. 

